I have just crunched and returned this task (739721) within 24hrs and received no bonus.
Created 28 May 2009 18:48:28 UTC
Sent 28 May 2009 19:11:31 UTC
Received 29 May 2009 18:48:43 UTC
Claimed credit 4038.48842592593
Granted credit 4038.48842592593
Because my wingman completed his WU after the 5 day deadline, but before me, I only receive the standard credit, even though I completed mine within 24hrs. You will find that I complete ALL of my tasks well within 48hrs, and most within 24hrs. I don't cache any WUs specifically to avoid overunning and to get the work back to the project as fast as possible (and yes, it does also give me extra credits ;)
Is this going to be a common occurence with the increasing need for work to be returned quickly?